Everyone that has shipped with courier companies on a regular basis knows that weather can affect your delivery times more than you would like. However, while rain might slow your delivery down a few minutes, or even hours, or extreme cold can cause vehicle breakdowns, nothing is more detrimental to an on time delivery than a healthy snow storm. Any Messenger Chicago company can tell you that if it's snowing, you need to revise your expectations about when your package is going to arrive.
Every courier or messenger company that you do business with is going to do their best to give you an accurate estimate of how long it is going to take your package to arrive. However, almost all of those estimates are based on normal to expected road conditions. Sometimes snow can come out of nowhere, without adequate warning. When it does, expect it to take longer for your package to arrive than what you were originally told.
Sometimes courier companies also phrase their delivery times in the form of a guarantee. A very typically example of this is couriers confined to a single city that offer one hour delivery. If you read the fine print of most of these offers you will see that they are not valid if it is snowing. This is a good sign that the couriers know just how much snow can slow down a delivery.
The reason snow is by far the most insidious weather for delivery drivers is because it affects so many different areas of your ability to make good time on the road. First of all, the roads become slippery, and it becomes harder to see. This not only makes all traffic move at a slower pace due to caution, but it also causes the most accidents. Accidents slow traffic down more than anything else, and if a major artery of a city becomes blocked, it can mean gridlock, and delayed packages all around.
The other thing to realize about snow, especially if you're shipping over long distances in the northern parts of the country, is that significant snowfall can for periods of time completely close certain highways. Also, this can affect air shipping time as well. Large snowfalls at certain airports, especially those which are unprepared, can delay or cancel all flights on a given day. The bottom line is that if it's snowing, you should tell your clients that their packages may be slightly late.